Fair Value Measurements (Restated) - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Interest Rate Swaps [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other long-term liabilities Interest rate swaps	$ (3,619)	$ (9,819)
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other long-term liabilities Interest rate swaps
Significant Other Observable Inputs Level 2 [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other long-term liabilities Interest rate swaps	(3,619)	(9,819)
Level 3 Unobservable Inputs [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Other long-term liabilities Interest rate swaps